Plate heat exchanger

Abstract

A plate heat exchanger causes heat exchange to be performed using a plurality of heat transfer plates stacked. Each of the heat transfer plates includes a plate body, a first-medium inlet, a first-medium outlet, a second-medium inlet, a second-medium outlet, and a projection that provides a passage. At least one of the first-medium inlet and the first-medium outlet is located at one of two corners at one end of the plate body which the projection contacts. At least one of the second-medium inlet and the second-medium outlet is located at one of two corners at the other end of the plate body from which the projection is separated.

1 . A plate heat exchanger that causes heat exchange to be performed using a plurality of heat transfer plates stacked,
 wherein the plurality of heat transfer plates include
 a first heat transfer plate configured to perform the heat exchange, 
 a second heat transfer plate configured to perform the heat exchange, stacked on the first heat transfer plate, with a first interlayer space provided between the first heat transfer plate and the second heat transfer plate, the first interlayer space being space through which a first medium flows, and 
   a third heat transfer plate configured to perform the heat exchange, and stacked on the second heat transfer plate, with a second interlayer space provided between the second transfer plate and the third heat transfer plate, the second interlayer space   being space through a second medium flows,   wherein the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate have the same shape, and each include
 a rectangular plate body configured to perform the heat exchange, 
 a first-medium inlet and a first-medium outlet or a second-medium inlet and a second-medium outlet, the first-medium inlet being configured to allow an inflow of the first medium, the first-medium outlet being configured to allow an outflow of the first medium, the second-medium inlet being configured to allow an inflow of a second medium, the second-medium outlet being configured to allow an outflow of the second medium, and 
 a projection contacting one end of the plate body and separated from an other end of the plate body in a longitudinal direction of the plate body, the projection projecting in a stacking direction where the heat transfer plates are stacked and providing a passage allowing the first medium or the second medium to flow therethough, 
   wherein the first-medium outlet is diagonally opposite to the first-medium inlet, and   wherein the second-medium outlet is diagonally opposite to the second-medium inlet.   
     
     
         2 . The plate heat exchanger of  claim 1 ,
 wherein the first-medium inlet of the first heat transfer plate and the first-medium inlet of the second heat transfer plate face each other, while spaced from each other,   wherein the second-medium inlet of the first heat transfer plate and the second-medium inlet of the second heat transfer plate are joined to each other,   wherein the second-medium outlet of the second heat transfer plate and the second-medium outlet of the third heat transfer plate face each other, while spaced from each other, and   wherein the first-medium outlet of the second heat transfer plate and the first-medium outlet of the third heat transfer plate are joined to each other.   
     
     
         3 . The plate heat exchanger of  claim 1 ,
 wherein a length of a passage in the first interlayer space that extends along the projection of the second heat transfer plate from the first-medium inlet to the first-medium outlet of the second heat transfer plate is greater than a length of a passage in the second interlayer space that extends along the projection of the third heat transfer plate from the second-medium inlet to the second-medium outlet of the third heat transfer plate.   
     
     
         4 . The plate heat exchanger of  claim 1 ,
 wherein an amount of change in a velocity vector from one of the first-medium inlet and the first-medium outlet of the second heat transfer plate to an other along the projection of the second heat transfer plate in the first interlayer space is larger than an amount of change in a velocity vector from one of the second-medium inlet and the second-medium outlet of the third heat transfer plate to an other along the projection of the third heat transfer plate in the second interlayer space.   
     
     
         5 . The plate heat exchanger of  claim 1 ,
 wherein a flow rate of the first medium in the first interlayer space is lower than a flow rate of the second medium in the second interlayer space.   
     
     
         6 . The plate heat exchanger of  claim 1 ,
 wherein the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate each include
 an other projection contacting the other end of the plate body and separated from the one end in the longitudinal direction, the other projection projecting in the stacking direction and providing a passage allowing the first medium or the second medium to flow therethrough, 
   wherein one of the first-medium inlet and the first-medium outlet is located at the one of the two corners at the one end of the plate body from which the other projection is separated,   wherein one of the second-medium inlet and the second-medium outlet is located at the one of the two corners at the other end of the plate body which the other projection contacts,   wherein an other of the first-medium inlet and the first-medium outlet is located at an other of the two corners at the other end of the plate body which the other projection contacts, and   wherein an other of the second-medium inlet and the second-medium outlet is located at an other of the two corners at the one end of the plate body from which the other projection is separated.   
     
     
         7 . The plate heat exchanger of  claim 1 ,
 wherein the first heat transfer plate, the second heat transfer plate, and the third heat transfer plate each include
 herringbone uneven portions arranged in a pattern of a V-shaped herringbone which tapers from the one end toward the other end of the plate body in the longitudinal direction, and 
   wherein the projection is located in such a manner as to divide the herringbone uneven portions.   
     
     
         8 . The plate heat exchanger of  claim 1 ,
 wherein the plurality of heat transfer plates further include a fourth heat transfer plate configured to perform the heat exchange and stacked on the third heat transfer plate, with a third interlayer space provided between the third heat transfer plate and the fourth heat transfer plate, and   wherein the fourth heat transfer plate is stacked on the third heat transfer plate such that the one end of the third heat transfer plate and the one end of the fourth heat transfer plate are in contact with each other.   
     
     
         9 . The plate heat exchanger of  claim 1 ,
 wherein an opening area of the first-medium inlet and an opening area of the first-medium outlet are smaller than an opening area of the second-medium inlet and an opening area of the second-medium outlet.   
     
     
         10 . The plate heat exchanger of  claim 1 ,
 wherein the first heat transfer plate and the second heat transfer plate are stacked such that the one end of the first heat transfer plate and the other end of the second heat transfer plate are in contact with each other.